When was this 2-piece eagle "A" button used? Is it military?

[McCDig]

I found this today near a house site in Baltimore, dating from 1803.
It is 19+mm in diameter, two-piece construction, with backmark reading "EXTRA RICH" and "M&?" for the maker.
This must be a 19th century button.

 

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[vpnavy]

Nice find! Until a member responds - take a look at Federal Infantry . They sure are similar (letter)...

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[nhbenz]

Artillery, 1840's-about 1861.

 

[duggap]

Artillery, 1840's-about 1861.

As usual he has it correct. In Albert's button book your button is on page 59, item AY75. Very nice button find.

 

[McCDig]

The one aspect I see as different between the two is the length of the eagle's neck and head, otherwise very similar as you point out. Is the picture you sent a one or two-piece button?